Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A method of wireless communication, comprising: determining, by an evolved Node B (eNB), a type of a Listen Before Talk (LBT) from multiple types of LBT to set in an uplink (UL) grant scheduled for transmission on a first frequency (F 1 ); setting, by the eNB based on the determined type, a LBT indication in the UL grant to correspond to a condition associated with a predetermined time window on a second frequency (F 2 ) allocated for a downlink transmission; and transmitting, by the eNB, the UL grant on the F 1 to a user equipment (UE), wherein the UL grant allocates uplink resources on the F 2 for the UE beginning at time T that overlaps the predetermined time window.
2. The method of claim 1 , wherein the condition corresponds to the downlink transmission occurring on the F 2 until time T p , wherein T p is prior to T, and a time delta between T and T p is less than a threshold.
This invention relates to wireless communication systems, specifically managing downlink transmissions in a frequency band (F2) to avoid interference with other systems. The problem addressed is ensuring reliable communication by controlling when transmissions occur in F2, particularly when another system may also use the same frequency band. The method involves monitoring a condition related to downlink transmissions in F2. The condition is met when the downlink transmission occurs on F2 until a time (Tp), where Tp is before a later time (T). Additionally, the time difference between T and Tp must be less than a predefined threshold. This ensures that transmissions in F2 are completed or adjusted before a critical time (T), preventing interference with other systems that may start using F2 at or after T. The method may also include adjusting transmission parameters, such as power or scheduling, to comply with the condition. The invention is useful in scenarios where multiple systems share the same frequency band, such as in cognitive radio or dynamic spectrum access networks. By enforcing the condition, the method ensures that transmissions in F2 do not overlap with other systems' operations, improving coexistence and reducing interference. The threshold for the time delta between T and Tp can be set based on system requirements, propagation delays, or regulatory constraints.
3. The method of claim 1 , wherein the type corresponds to a first type of LBT if the condition is met at time T and a second type of LBT if the condition is not met at time T.
This invention relates to wireless communication systems, specifically to methods for performing Listen-Before-Talk (LBT) procedures in unlicensed spectrum. The problem addressed is the need for flexible and efficient LBT mechanisms to adapt to varying channel conditions and regulatory requirements. The method involves determining whether a specific condition is met at a predefined time T. If the condition is satisfied at time T, a first type of LBT is performed, which may involve a shorter or less stringent backoff procedure. If the condition is not met, a second type of LBT is performed, which may involve a longer or more stringent backoff procedure. The condition could relate to factors such as channel occupancy, interference levels, or regulatory constraints. The first and second types of LBT may differ in their backoff algorithms, sensing durations, or priority levels. This adaptive approach ensures compliance with regulatory rules while optimizing spectrum usage. The method can be applied in systems like Wi-Fi or 5G NR-U, where dynamic LBT adjustments are necessary to handle diverse operational scenarios. By dynamically selecting the LBT type based on real-time conditions, the system improves efficiency and reduces contention in unlicensed bands.
4. The method of claim 3 , wherein the first type of LBT corresponds to no LBT, a one shot LBT, or a short LBT, and the second type of LBT corresponds to a full clear channel assessment (CCA).
This invention relates to wireless communication systems, specifically methods for performing listen-before-talk (LBT) procedures to manage channel access. The problem addressed is the need for efficient and flexible LBT mechanisms to support different types of transmissions in shared spectrum environments, such as unlicensed or licensed shared access (LSA) bands. The method involves selecting between two types of LBT procedures for channel access. The first type of LBT is a simplified or omitted procedure, which may include no LBT, a one-shot LBT (a single quick check), or a short LBT (a brief assessment). The second type is a full clear channel assessment (CCA), which involves a more thorough evaluation of the channel to ensure it is clear before transmission. The selection between these LBT types is based on predefined criteria, such as the priority or urgency of the transmission, the type of data being sent, or regulatory requirements. This approach allows for optimized channel access, reducing unnecessary delays for low-priority or time-sensitive transmissions while ensuring compliance with stricter requirements when needed. The method can be applied in various wireless communication standards, including those using shared spectrum resources.
5. The method of claim 3 , wherein the first type of LBT corresponds to a full clear channel assessment (CCA) and the second type of LBT corresponds to no LBT, a one shot LBT, or a short LBT.
This invention relates to wireless communication systems, specifically methods for performing listen-before-talk (LBT) procedures to manage channel access. The problem addressed is the need for flexible and efficient channel access mechanisms in wireless networks, particularly in scenarios where different levels of contention or priority are required. The method involves using two distinct types of LBT procedures for channel access. The first type is a full clear channel assessment (CCA), which involves a comprehensive evaluation of the channel to determine if it is clear before transmission. This ensures robust contention resolution in high-interference environments. The second type of LBT is more relaxed, encompassing either no LBT, a one-shot LBT (a single quick check), or a short LBT (a brief assessment). These lighter-weight procedures reduce latency and overhead in lower-contention scenarios. The method dynamically selects between these LBT types based on network conditions, traffic priority, or other operational factors. This adaptability improves spectral efficiency and reduces unnecessary delays while maintaining reliable channel access. The invention is particularly useful in systems like Wi-Fi or 5G, where different traffic types (e.g., real-time vs. best-effort) require varying levels of contention resolution. By optimizing LBT procedures, the method enhances overall network performance and fairness.
6. The method of claim 5 , wherein the second type of LBT corresponds to no LBT.
This invention relates to wireless communication systems, specifically methods for performing Listen-Before-Talk (LBT) procedures in unlicensed spectrum. The problem addressed is the need for efficient and flexible LBT mechanisms to support different types of transmissions, particularly in scenarios where certain transmissions may not require LBT. The method involves determining a type of LBT procedure to perform before transmitting data. A first type of LBT corresponds to a standard LBT procedure, where the transmitter checks for channel availability before transmitting. A second type of LBT corresponds to no LBT, meaning the transmitter can transmit without checking for channel availability. The method selects the appropriate LBT type based on predefined criteria, such as the type of transmission, regulatory requirements, or network conditions. This allows for optimized use of the unlicensed spectrum, reducing latency for certain transmissions while ensuring compliance with regulatory constraints. The invention also includes mechanisms for configuring and signaling the LBT type to the transmitter, ensuring that the appropriate LBT procedure is applied. This flexibility is particularly useful in systems where some transmissions, such as ultra-reliable low-latency communications (URLLC), may require immediate access to the channel without the delay introduced by LBT. By selectively applying or omitting LBT, the system can balance efficiency and reliability.
7. The method of claim 5 , wherein the second type of LBT corresponds to one shot LBT.
A method for wireless communication involves performing listen-before-talk (LBT) procedures to access a shared communication channel. The method addresses the need for efficient channel access in dense wireless networks where multiple devices compete for limited spectrum resources. The invention includes a first LBT procedure for initial channel access and a second LBT procedure for subsequent transmissions. The second LBT procedure is optimized for reduced latency by using a one-shot LBT mechanism, which simplifies the channel sensing process by performing a single clear channel assessment (CCA) check before transmission. This approach reduces overhead and improves throughput in scenarios where rapid retransmissions or multiple transmissions are required. The method ensures fair channel access while minimizing delays, particularly in environments with high contention or strict latency requirements. The one-shot LBT is designed to work alongside other LBT types, allowing flexibility in adapting to different regulatory or operational constraints. The invention is applicable to wireless systems such as Wi-Fi, 5G, or other shared-spectrum technologies where efficient channel utilization is critical.
8. The method of claim 3 , wherein the downlink transmission corresponds to a transmission from a serving eNB or a set of eNBs or RRHs in a CoMP set.
The invention relates to wireless communication systems, specifically improving downlink transmissions in heterogeneous networks with coordinated multipoint (CoMP) transmission techniques. The problem addressed is optimizing downlink communication efficiency and reliability in scenarios where a user equipment (UE) receives signals from multiple base stations or remote radio heads (RRHs) in a CoMP set, or from a single serving evolved NodeB (eNB). The method involves coordinating downlink transmissions from one or more network nodes to enhance signal quality and reduce interference. When a UE is served by a single eNB, the downlink transmission originates from that eNB. Alternatively, if CoMP is enabled, the downlink transmission is coordinated among a set of eNBs or RRHs, where multiple nodes jointly transmit data to the UE. This coordination can include techniques like joint transmission, dynamic point selection, or coordinated beamforming to improve coverage and throughput. The method ensures seamless integration of CoMP techniques with traditional single-eNB transmissions, allowing the network to dynamically switch between modes based on UE requirements and network conditions. This approach enhances spectral efficiency, reduces interference, and improves overall system performance in heterogeneous networks.
9. The method of claim 1 , wherein the condition corresponds to the downlink transmission occurring on the F 2 at time T.
This invention relates to wireless communication systems, specifically methods for managing downlink transmissions in a network with multiple frequency bands. The problem addressed is ensuring efficient and reliable downlink communication by dynamically selecting the appropriate frequency band for transmission based on specific conditions. The method involves monitoring a condition related to downlink transmissions and determining whether to transmit data on a first frequency band (F1) or a second frequency band (F2) at a specific time (T). The condition corresponds to the downlink transmission occurring on F2 at time T, indicating that the system prioritizes F2 for transmission under certain circumstances. This may be due to factors such as signal quality, interference levels, or network load. The method also includes transmitting the downlink data on F2 at time T when the condition is met, ensuring optimal use of available frequency resources. Additionally, the system may adjust transmission parameters, such as power levels or modulation schemes, to enhance performance on F2. The invention aims to improve spectral efficiency and reduce latency by dynamically selecting the best frequency band for downlink transmissions based on real-time conditions.
10. The method of claim 1 , wherein the F 1 and the F 2 are a same frequency.
A system and method for signal processing involves generating and analyzing two frequency components, F1 and F2, to improve signal detection or communication performance. The invention addresses challenges in signal processing where frequency mismatches between components can lead to interference, reduced accuracy, or inefficient data transmission. By ensuring F1 and F2 operate at the same frequency, the system enhances synchronization, reduces phase noise, and improves signal integrity. This approach is particularly useful in wireless communication, radar systems, or sensor networks where precise frequency alignment is critical. The method may include generating F1 and F2 using a shared oscillator or phase-locked loop to maintain frequency coherence. The system may further include filtering, amplification, or modulation stages to refine the signals before transmission or analysis. By maintaining identical frequencies for F1 and F2, the invention mitigates errors caused by frequency drift or misalignment, leading to more reliable signal processing outcomes. The technique can be applied in various applications, including but not limited to, phase-coherent communication systems, interferometry, and frequency-hopping spread spectrum technologies. The invention ensures that the two frequency components remain synchronized, improving overall system performance and robustness.
11. A method of wireless communication, comprising: receiving, by a user equipment (UE) on a first frequency (F 1 ), an uplink (UL) grant transmitted by an evolved Node B (eNB), wherein the UL grant allocates, for the UE, uplink resources on a second frequency (F 2 ); determining a type of listen before talk (LBT) based on an LBT indication in the UL grant; accessing the F 2 by performing, based on the determined type of LBT, full clear channel assessment (CCA) on the F 2 based on a one shot LBT on the F 2 being unsuccessful; and performing UL transmission on the F 2 based on the UL grant.
This invention relates to wireless communication systems, specifically methods for managing uplink (UL) transmissions in unlicensed spectrum using listen-before-talk (LBT) procedures. The problem addressed is efficient and reliable UL transmission in shared frequency bands where devices must contend for access using LBT mechanisms. The method involves a user equipment (UE) receiving an uplink grant from an evolved Node B (eNB) on a first frequency (F1). The grant allocates UL resources on a second frequency (F2), which operates in an unlicensed band. The UE determines the type of LBT required based on an LBT indication included in the grant. If a one-shot LBT (a quick channel assessment) on F2 is unsuccessful, the UE performs a full clear channel assessment (CCA), which is a more thorough evaluation of the channel's availability. After confirming the channel is clear, the UE proceeds with UL transmission on F2 according to the allocated resources. This approach ensures that the UE adapts its LBT procedure dynamically based on the eNB's instructions, optimizing channel access while minimizing contention in unlicensed spectrum. The method improves reliability and efficiency in wireless communication systems operating in shared frequency bands.
12. The method of claim 11 , wherein determining the type of LBT includes determining that an LBT indicator is set to indicate no LBT, and wherein accessing the F 2 includes performing UL transmission on the F 2 , in response to determining that the LBT indicator is set to indicate no LBT, without performing LBT on the F 2 .
In wireless communication systems, particularly those operating in unlicensed frequency bands, Listen-Before-Talk (LBT) is used to avoid interference by checking channel availability before transmission. However, LBT can introduce latency, which is undesirable for certain applications. This invention addresses the need for efficient uplink (UL) transmission in such systems by selectively bypassing LBT when appropriate. The method involves determining the type of LBT required for a frequency band (F2) by checking an LBT indicator. If the indicator is set to indicate no LBT, the system performs UL transmission on F2 without performing LBT. This allows for faster transmission when channel conditions or regulatory requirements permit. The method may also include other steps, such as determining the type of LBT based on channel conditions, regulatory requirements, or network configuration, and adjusting transmission parameters accordingly. By dynamically skipping LBT when unnecessary, the system reduces latency while maintaining compliance with regulatory standards. This approach is particularly useful in scenarios where low-latency communication is critical, such as in 5G New Radio (NR) unlicensed (NR-U) deployments.
13. The method of claim 11 , wherein determining the type of LBT includes determining that an LBT indicator is set to indicate one shot LBT, and wherein accessing the F 2 includes performing one shot LBT on the F 2 , in response to determining that the LBT indicator is set to indicate one shot LBT, prior to performing UL transmission on the F 2 .
This invention relates to wireless communication systems, specifically to methods for performing Listen-Before-Talk (LBT) procedures in unlicensed frequency bands. The problem addressed is the need for efficient and flexible LBT mechanisms to ensure proper channel access while minimizing delays in uplink (UL) transmissions. The method involves determining the type of LBT required for a specific frequency band (F2) by checking an LBT indicator. If the indicator is set to "one shot LBT," the system performs a one-shot LBT procedure on F2 before initiating UL transmission. One-shot LBT involves a single channel sensing attempt, reducing latency compared to multi-shot LBT, which requires repeated sensing attempts. This approach optimizes channel access in scenarios where quick transmission is prioritized over exhaustive channel sensing. The method ensures compliance with regulatory requirements for unlicensed spectrum while improving transmission efficiency. By dynamically adjusting the LBT procedure based on the indicator setting, the system can adapt to different operational conditions, such as varying interference levels or quality-of-service requirements. This flexibility enhances reliability and reduces unnecessary delays in UL communications.
14. The method of claim 11 , wherein determining the type of LBT includes determining that an LBT indicator is set to indicate UE decision.
In wireless communication systems, Listen-Before-Talk (LBT) mechanisms are used to manage channel access in unlicensed spectrum, ensuring fair coexistence with other devices. A key challenge is efficiently determining the type of LBT performed by a User Equipment (UE) to optimize resource allocation and interference management. Existing solutions often rely on predefined LBT categories or static configurations, which may not adapt to dynamic network conditions. This invention addresses the problem by introducing a method for dynamically determining the type of LBT performed by a UE. The method involves analyzing an LBT indicator, which is a signal or flag set by the UE to indicate its decision-making process. When the LBT indicator is set to "UE decision," it signifies that the UE has autonomously determined the LBT type based on local conditions, such as channel occupancy, interference levels, or traffic priority. This allows the network to adjust scheduling and resource allocation accordingly, improving efficiency and reducing collisions. The method may also include additional steps, such as receiving an LBT configuration from a base station, performing the LBT procedure based on the configuration, and transmitting data only if the channel is clear. The LBT indicator can be embedded in control signaling or transmitted as part of a scheduling request. By dynamically assessing the LBT type, the system can better adapt to varying network conditions, enhancing overall performance in unlicensed spectrum operations.
15. The method of claim 11 , wherein determining the type of LBT includes determining that an LBT indicator is set to indicate the full CCA, and wherein accessing the F 2 includes performing the full CCA on the F 2 , in response to determining that the LBT indicator is set to indicate full CCA, prior to performing UL transmission on the F 2 .
This invention relates to wireless communication systems, specifically methods for performing Listen-Before-Talk (LBT) procedures in unlicensed frequency bands. The problem addressed is ensuring proper channel access and interference avoidance in shared spectrum environments, where multiple devices may contend for the same frequency resources. The method involves determining the type of LBT procedure to be performed before transmitting on a frequency band (F2). Specifically, it checks whether an LBT indicator is set to indicate a full Clear Channel Assessment (CCA). If the indicator confirms full CCA is required, the system performs a full CCA on F2 before proceeding with uplink (UL) transmission. This ensures that the channel is clear of other transmissions, reducing the risk of collisions and interference. The full CCA involves monitoring the channel for a specified duration to detect any ongoing transmissions. Only if the channel is determined to be idle, the UL transmission is allowed. This approach enhances reliability and fairness in shared spectrum usage, particularly in scenarios where multiple devices may attempt to access the same frequency band simultaneously. The method is applicable in wireless communication systems operating in unlicensed bands, such as Wi-Fi or cellular networks using LBT-based protocols.
16. The method of claim 11 , wherein the determined type of LBT is based on whether there are one or more transmissions on the F 2 within a threshold of time prior to a first UL subframe indicated in the UL grant.
This invention relates to wireless communication systems, specifically to methods for determining the type of Listen-Before-Talk (LBT) procedure used in unlicensed spectrum transmissions. The problem addressed is efficiently selecting the appropriate LBT type for uplink (UL) transmissions in scenarios where the unlicensed spectrum may have varying levels of activity. The method involves analyzing the transmission history on a frequency band (F2) within a defined time window before a scheduled UL subframe. If one or more transmissions are detected on F2 within this threshold time, a specific LBT type is selected for the UL transmission. This ensures compliance with regulatory requirements while optimizing resource utilization. The solution improves spectral efficiency by dynamically adjusting LBT procedures based on real-time channel conditions, reducing unnecessary delays in UL transmissions when the channel is already active. The method is particularly useful in systems like LTE-LAA or 5G NR-U, where unlicensed spectrum sharing is critical. The invention enhances reliability and fairness in shared spectrum environments by adapting LBT behavior to observed traffic patterns.
17. The method of claim 11 , wherein the F 1 and the F 2 are a same frequency.
A system and method for signal processing involves generating and analyzing two frequency components, F1 and F2, derived from an input signal. The system captures the input signal, which may be an audio, electromagnetic, or other waveform, and processes it to extract frequency components. These components are then filtered, amplified, or otherwise conditioned to produce F1 and F2. In this specific implementation, F1 and F2 are set to the same frequency, meaning they are identical in frequency but may differ in phase, amplitude, or other characteristics. The system may use these components for applications such as interference cancellation, signal modulation, or frequency analysis. The method ensures that the two frequency components are synchronized, allowing for precise control over their interaction. This approach is useful in fields like telecommunications, radar, and audio processing, where maintaining phase coherence or amplitude balance between frequency components is critical. The system may include analog or digital processing stages, depending on the application, and may incorporate feedback mechanisms to dynamically adjust the frequency components in response to changing input conditions.
18. The method of claim 11 , wherein the UL transmission on the F 2 is performed after performing the full CCA on the F 2 .
Wireless communication systems often face challenges in efficiently utilizing unlicensed frequency bands, where regulatory requirements mandate clear channel assessment (CCA) procedures to avoid interference with other users. This invention addresses the need for reliable and compliant uplink (UL) transmissions in such environments. The method involves performing a full CCA on a secondary frequency band (F2) before executing an uplink transmission on that band. The full CCA ensures that the channel is clear of other transmissions, complying with regulatory standards and minimizing interference. This approach is particularly useful in scenarios where multiple devices or networks share the same unlicensed spectrum, as it helps maintain orderly and interference-free communication. The method may also include additional steps such as determining the availability of the primary frequency band (F1) and switching to F2 if F1 is unavailable or congested. By integrating the full CCA process into the transmission workflow, the invention enhances the reliability and regulatory compliance of wireless communications in unlicensed bands.
19. The method of claim 11 , further comprising: performing the one shot LBT on the F 2 based on the determined type of LBT; and determining whether the one shot LBT on the F 2 is successful.
This invention relates to wireless communication systems, specifically to methods for performing Listen-Before-Talk (LBT) procedures in unlicensed frequency bands. The problem addressed is the need for efficient and reliable channel access in shared spectrum environments, where devices must contend for access while minimizing interference. The method involves determining the type of LBT to be performed on a secondary frequency band (F2) based on predefined criteria, such as channel conditions or regulatory requirements. The LBT type may include different sensing durations, backoff algorithms, or energy detection thresholds. After determining the LBT type, a one-shot LBT procedure is executed on F2, where the channel is sensed once to determine its availability. The outcome of this LBT is then evaluated to decide whether transmission can proceed. If successful, the device may transmit data on F2; if unsuccessful, the device may defer transmission or retry the LBT. This approach improves spectral efficiency by dynamically adapting the LBT process to varying conditions, reducing unnecessary delays while ensuring compliance with regulatory constraints. The method is particularly useful in scenarios where multiple devices compete for access to unlicensed spectrum, such as in Wi-Fi or 5G NR-U deployments.
20. The method of claim 11 , further comprising determining whether the LBT indication is set to indicate UE decision, and wherein the one shot LBT on the F 2 is performed based on determining that the LBT indication is set to indicate UE decision.
This invention relates to wireless communication systems, specifically to methods for performing Listen-Before-Talk (LBT) procedures in unlicensed spectrum. The problem addressed is the need for efficient and flexible LBT mechanisms in scenarios where user equipment (UE) may need to make autonomous decisions regarding channel access. The method involves determining whether an LBT indication is set to indicate a UE decision. If the LBT indication is set to indicate UE decision, a one-shot LBT procedure is performed on a frequency band (F2). The one-shot LBT procedure involves a single attempt to assess channel availability before transmitting. This allows the UE to autonomously decide whether to proceed with transmission based on the LBT outcome, improving flexibility in unlicensed spectrum operations. The method may also include additional steps such as receiving configuration information from a network node, where the configuration specifies parameters for the LBT procedure, and performing the LBT procedure according to those parameters. The invention aims to enhance efficiency and reliability in wireless communications by enabling dynamic LBT decisions based on UE-specific conditions.
21. A wireless communication apparatus, comprising: at least one processor configured to: receive, by a user equipment (UE) on a first frequency (F 1 ), an uplink (UL) grant transmitted by an evolved Node B (eNB), wherein the UL grant allocates, for the UE, uplink resources on a second frequency (F 2 ); determine a type of listen before talk (LBT) based on an LBT indication in the UL grant; access the F 2 according to the determined type of LBT, wherein to access the F 2 , the at least one processor is further configured to perform full clear channel assessment (CCA) on the F 2 based on a one shot LBT on the F 2 being unsuccessful; and perform UL transmission on the F 2 based on the UL grant; and at least one memory coupled to the at least one processor.
A wireless communication apparatus is designed to improve uplink (UL) transmission efficiency in shared spectrum environments, particularly where listen-before-talk (LBT) procedures are required. The apparatus includes a user equipment (UE) configured to receive an uplink grant from an evolved Node B (eNB) on a first frequency (F1). The grant allocates UL resources on a second frequency (F2), which may operate in a shared spectrum requiring LBT. The UE determines the type of LBT to perform based on an LBT indication included in the grant. If a one-shot LBT on F2 is unsuccessful, the UE performs a full clear channel assessment (CCA) before accessing F2. After successfully accessing F2, the UE transmits uplink data according to the grant. This approach ensures efficient spectrum utilization while complying with LBT regulations, reducing contention and improving transmission reliability in shared frequency bands. The apparatus includes at least one processor and memory to execute these functions.
22. The wireless communication apparatus of claim 21 , wherein the at least one processor is configured to determine the type of LBT by determining that an LBT indicator is set to indicate no LBT, and wherein the at least one processor is configured to access the F 2 by performing UL transmission on the F 2 , in response to the determining that the LBT indicator is set to indicate no LBT, without performing LBT on the F 2 .
A wireless communication apparatus is designed to optimize channel access in wireless networks, particularly in scenarios where Listen-Before-Talk (LBT) procedures are used to avoid interference. The apparatus includes at least one processor configured to determine the type of LBT required for a frequency band (F2) by checking an LBT indicator. If the LBT indicator is set to indicate no LBT, the processor bypasses the LBT procedure and directly performs uplink (UL) transmission on F2. This allows for faster and more efficient channel access when LBT is not required, reducing latency and improving throughput. The apparatus may also include a transceiver for wireless communication and a memory for storing instructions and data. The LBT indicator may be received from a network node or determined based on predefined rules, ensuring compliance with regulatory or network-specific requirements. This approach is particularly useful in licensed or lightly licensed spectrums where LBT may not always be mandatory, enabling more flexible and efficient spectrum utilization.
23. The wireless communication apparatus of claim 21 , wherein the at least one processor is configured to determine the type of LBT by determining that an LBT indicator is set to indicate one shot LBT, and wherein the at least one processor is configured to access the F 2 by performing one shot LBT on the F 2 , in response to the determining that the LBT indicator is set to indicate one shot LBT, prior to performing UL transmission on the F 2 .
This invention relates to wireless communication systems, specifically to a method for performing Listen-Before-Talk (LBT) procedures in unlicensed frequency bands. The problem addressed is the need for efficient and flexible LBT mechanisms to ensure proper channel access while minimizing delays in uplink (UL) transmissions. The wireless communication apparatus includes at least one processor configured to determine the type of LBT to be performed. The processor checks an LBT indicator to identify whether one-shot LBT is required. One-shot LBT is a simplified LBT procedure where the channel is assessed only once before transmission, unlike traditional LBT methods that may involve multiple checks. If the LBT indicator specifies one-shot LBT, the processor performs this procedure on a frequency band (F2) before initiating UL transmission on that band. This ensures compliance with regulatory requirements while optimizing transmission efficiency. The apparatus may also include additional components, such as a transceiver for wireless communication and memory for storing configuration data. The invention improves spectral efficiency and reduces latency in unlicensed spectrum operations by dynamically selecting the appropriate LBT method based on the indicator.
24. The wireless communication apparatus of claim 21 , the at least one processor is configured to determine the type of LBT by determining that an LBT indicator is set to indicate UE decision.
This invention relates to wireless communication systems, specifically to apparatuses and methods for performing Listen-Before-Talk (LBT) procedures in unlicensed spectrum. The problem addressed is the need for efficient and flexible LBT mechanisms to support different types of devices, particularly user equipment (UE), in shared spectrum environments. The wireless communication apparatus includes at least one processor configured to determine the type of LBT procedure to be used. This determination is made by evaluating an LBT indicator, which is set to indicate whether the LBT decision is made by the UE itself or by another entity, such as a base station. The apparatus may also include a transceiver for wireless communication and a memory storing instructions executable by the processor. The LBT procedure is used to ensure fair and interference-free access to the unlicensed spectrum by checking for channel availability before transmission. The processor may further be configured to perform the LBT procedure based on the determined type, which could involve different backoff algorithms, clear channel assessment (CCA) thresholds, or other parameters. The apparatus may also support multiple LBT categories, such as Category 4 LBT for uplink transmissions or Category 2 LBT for downlink transmissions, depending on the network configuration and the UE's capabilities. The invention aims to improve spectrum utilization and reduce collisions in wireless networks operating in unlicensed bands.
25. The wireless communication apparatus of claim 21 , wherein the at least one processor is configured to determine the type of LBT by determining that an LBT indicator is set to indicate the full CCA, and wherein the at least one processor is configured to access the F 2 by performing the full CCA on the F 2 , in response to the determining that the LBT indicator is set to indicate full CCA, prior to performing UL transmission on the F 2 .
This invention relates to wireless communication systems, specifically to a method for performing Listen-Before-Talk (LBT) procedures in unlicensed frequency bands. The problem addressed is ensuring proper channel access in shared spectrum environments, where devices must verify channel availability before transmitting to avoid interference. The wireless communication apparatus includes at least one processor configured to determine the type of LBT procedure to be performed. The processor checks an LBT indicator to decide whether to use a full Clear Channel Assessment (CCA) or another LBT type. If the indicator specifies full CCA, the processor performs this procedure on a frequency band (F2) before initiating uplink (UL) transmission. Full CCA involves sensing the channel for a defined period to confirm it is idle, ensuring compliance with regulatory requirements for unlicensed spectrum use. This mechanism prevents unauthorized transmissions and reduces interference in shared frequency bands. The apparatus may also include additional components, such as a transceiver for wireless communication and memory for storing configuration data. The invention improves reliability and efficiency in wireless networks operating in unlicensed spectrum by enforcing proper channel access protocols.
26. The wireless communication apparatus of claim 21 , wherein the determined type of LBT is based on whether there are one or more transmissions on the F 2 within a threshold of time prior to a first UL subframe indicated in the UL grant.
This invention relates to wireless communication systems, specifically to a wireless communication apparatus that performs Listen-Before-Talk (LBT) procedures for uplink (UL) transmissions. The problem addressed is ensuring efficient and compliant LBT operations in scenarios where multiple transmissions may occur on a shared frequency band (F2) before an uplink subframe. The apparatus determines the type of LBT to perform based on whether one or more transmissions have occurred on the shared frequency band within a specified time threshold prior to the first uplink subframe indicated in an uplink grant. If transmissions are detected within this threshold, the apparatus may adjust the LBT type to ensure proper channel access compliance. This mechanism helps avoid collisions and ensures fair sharing of the spectrum while maintaining regulatory requirements. The apparatus may also include features for receiving downlink control information (DCI) and determining the start time of the first uplink subframe based on the DCI. The LBT procedure is dynamically adapted to the detected transmission activity, improving reliability and efficiency in shared spectrum environments.
27. The wireless communication apparatus of claim 21 , wherein the F 1 and the F 2 are a same frequency.
This invention relates to wireless communication systems, specifically addressing challenges in managing frequency resources for efficient and reliable data transmission. The apparatus includes a transmitter and receiver configured to operate on two frequency components, F1 and F2, which are set to the same frequency. This configuration allows for improved synchronization and reduced interference between the two components, enhancing signal integrity and communication performance. The apparatus may also include mechanisms for adjusting transmission power, modulating signals, and handling data packets to optimize communication efficiency. By using identical frequencies for F1 and F2, the system simplifies frequency planning and reduces complexity in signal processing, making it suitable for applications requiring high reliability and low latency, such as industrial automation, vehicular communications, or IoT networks. The apparatus may further incorporate error correction techniques and adaptive modulation to ensure robust data transmission under varying channel conditions. The use of a single frequency for both components minimizes hardware requirements and operational overhead, while maintaining high data throughput and minimizing signal distortion. This approach is particularly beneficial in environments where spectrum availability is limited or where interference mitigation is critical.
28. A communication apparatus, comprising: at least one processor configured to: determine, by an evolved Node B (eNB), a type of a Listen Before Talk (LBT) of multiple types of LBT to set in an uplink (UL) grant scheduled for transmission on a first frequency (F 1 ); set, by the eNB based on the determined type, a LBT indication in the UL grant to correspond to a condition associated with a predetermined time window on a second frequency (F 2 ) allocated for a downlink transmission; and transmit, by the eNB, the UL grant on the F 1 to a user equipment (UE), wherein the UL grant allocates uplink resources on the F 2 for the UE beginning at time T that overlaps the predetermined time window; and at least one memory coupled to the at least one processor.
This invention relates to wireless communication systems, specifically addressing the coordination of Listen Before Talk (LBT) procedures in uplink (UL) transmissions between a base station (evolved Node B, or eNB) and user equipment (UE). The problem solved is ensuring efficient use of shared frequency bands, particularly when different frequencies are allocated for uplink and downlink transmissions. The invention involves dynamically selecting an LBT type from multiple available options for an uplink grant scheduled on a first frequency (F1). The eNB determines the appropriate LBT type based on conditions associated with a predetermined time window on a second frequency (F2), which is allocated for downlink transmission. The eNB then sets an LBT indication in the UL grant to reflect this condition and transmits the grant to the UE. The UL grant allocates uplink resources on F2 for the UE, beginning at a time T that overlaps the predetermined time window on F2. This ensures that the UE's uplink transmission aligns with the downlink transmission window, optimizing spectrum usage and reducing interference. The system includes at least one processor and memory to execute these functions.
29. The communication apparatus of claim 28 , wherein the LBT indication and the condition indicate that the UE is to performing full clear channel assessment (CCA) on the F 2 based on a one shot LBT on the F 2 being unsuccessful.
COMMUNICATION APPARATUS AND METHOD This invention relates to wireless communication systems and addresses the problem of efficiently managing channel access when a device is attempting to transmit. Specifically, the apparatus comprises a communication device, such as a User Equipment (UE), and includes circuitry for performing a clear channel assessment (CCA) and for transmitting and receiving data. The device is configured to receive an indication related to Listen Before Talk (LBT) and a condition. When the LBT indication signifies that a "one shot" LBT attempt on a specific frequency band F2 was unsuccessful, and the condition also indicates this, the apparatus is directed to perform a full CCA on that same frequency band F2. This ensures a thorough assessment of channel availability after an initial, less comprehensive, LBT attempt fails.
Unknown
October 6, 2020
Browse 5M+ US patents with plain-English claim translations and AI-generated analysis.